1645: [Usaco2007 Open]City Horizon 城市地平线
Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 616 Solved: 283
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Description
Farmer John has taken his cows on a trip to the city! As the sun sets, the cows gaze at the city horizon and observe the beautiful silhouettes formed by the rectangular buildings. The entire horizon